UK Geocode & Coordinate Converter
Convert between UK addresses, WGS84 lat/lon, British National Grid easting/northing, and what3words — single lookups or batch CSV.
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Address Lookup only works for properties with a registered Energy Performance Certificate (EPC),
since the EPC register is the only free open-data source that resolves an address to a UPRN.
The Lat/Lon, Easting/Northing and what3words
conversion modes work without an EPC — lat/lon ↔ what3words anywhere in the world; any mode involving Easting/Northing is limited to Great Britain (OSGB36 only covers GB).
🔍 Lookup
Paste a whole address (incl. a property name, e.g. Rose Cottage). Uses the premium
OS Places match when available — otherwise the fields below are used.
or
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🔐 Admin Login
More tools behind the admin login
Log in for batch CSV/Excel processing, Lat/Lon · Easting/Northing · what3words conversions, and REST API access.